C#：如何将 BITMAP 字节数组转换为 JPEG 格式？
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C#: How to convert BITMAP byte array to JPEG format?
提问by Marc
How can I convert a BITMAP in byte array format to JPEG format using .net 2.0?
如何使用 .net 2.0 将字节数组格式的 BITMAP 转换为 JPEG 格式？
采纳答案by Marc Gravell
What type of byte[]do you mean? The raw file-stream data? In which case, how about something like (using System.Drawing.dllin a client application):
byte[]你指的是什么类型？原始文件流数据？在这种情况下，例如（System.Drawing.dll在客户端应用程序中使用）如何：
using(Image img = Image.FromFile("foo.bmp"))
{
img.Save("foo.jpg", ImageFormat.Jpeg);
}
Or use FromStreamwith a new MemoryStream(arr)if you really do have a byte[]:
或者FromStream，new MemoryStream(arr)如果您确实有一个，请与 a 一起使用byte[]：
byte[] raw = ...todo // File.ReadAllBytes("foo.bmp");
using(Image img = Image.FromStream(new MemoryStream(raw)))
{
img.Save("foo.jpg", ImageFormat.Jpeg);
}
回答by baretta
If it is just a buffer of raw pixel data, and not a complete image file(including headers etc., such as a JPEG) then you can't use Image.FromStream.
如果它只是原始像素数据的缓冲区，而不是完整的图像文件（包括标题等，例如 JPEG），则不能使用 Image.FromStream。
I think what you might be looking for is System.Drawing.Bitmap.LockBits, returning a System.Drawing.Imaging.ImageData; this provides access to reading and writing the image's pixels using a pointer to memory.
我想你可能正在寻找的是 System.Drawing.Bitmap.LockBits，返回一个 System.Drawing.Imaging.ImageData; 这提供了使用指向内存的指针读取和写入图像像素的访问。
回答by juanjo.arana
public static Bitmap BytesToBitmap(byte[] byteArray)
{
using (MemoryStream ms = new MemoryStream(byteArray))
{
Bitmap img = (Bitmap)Image.FromStream(ms);
return img;
}
}
